feat: Begins room-pressure calculator

Sources/Routes/Models/ClimateZone.swift

@@ -0,0 +1,31 @@
+public enum ClimateZone: String, Codable, Equatable, Sendable {
+  case dry
+  case hotHumid
+  case marine
+  case moist
+
+  public var zoneIdentifiers: [String] {
+    switch self {
+    case .dry:
+      return ["2B", "3B", "4B", "5B", "6B", "7B"]
+    case .hotHumid:
+      return ["1A", "2A"]
+    case .marine:
+      return ["3C", "4C"]
+    case .moist:
+      return ["3A", "4A", "5A", "6A", "7A"]
+    }
+  }
+
+  public var cfmPerTon: Int {
+    switch self {
+    case .dry: return 450
+    case .hotHumid: return 350
+    case .marine, .moist: return 400
+    }
+  }
+
+  public var label: String {
+    return "\(rawValue.capitalized) (\(zoneIdentifiers.joined(separator: ",")))"
+  }
+}